Scurry Oak, Intruder Alarm, Steel Overseer, and Liquimetal Coating

Prerequisites

• Scurry Oak on the battlefield
• Intruder Alarm on the battlefield
• Steel Overseer on the battlefield
• Liquimetal Coating on the battlefield
• Steel Overseer does not have summoning sickness

Steps

1. Activate Liquimetal Coating by tapping it, causing Scurry Oak to become an artifact creature until end of turn
2. Activate Steel Overseer by tapping it, putting +1/+1 counter on each artifact creature you control
3. Scurry Oak triggers, creating a 1/1 Squirrel creature token
4. The Squirrel enters the battlefield, triggering Intruder Alarm, untapping all creatures
5. Repeat from step 2

Results

• Infinite +1/+1 counters on Scurry Oak and artifact creatures you control
• Infinite creature tokens
• Infinite ETB
• Infinite mana creatures you control can produce
• Infinite untap of all creatures